belden



(No Modl.) 1 2 sheets-sheen 1.

L. BELDEN.

HYDRAULIC JACK;

110.371,91). Patented 001;. 25, 1887. l T 'l "w l@ f' Y c z e/l d.- dl

. (No Model.) `2 Sheets--Sheeti 2.

L. BELDEN. HYDRAULIC 1110K.

110.371,919. Patented 0,01. 25, 1887.

L *I jgs' Lastra nathan, or New YORK, N. Y.

HYDRAULIC JACK.

SPECIFICATION forming para of Letters Patent No. 371,919, dated october 2s, 1887.

Application tiled January 13, 185'?. Se1'ia1No.2i24,2S7. (No model.)

To all whom it may concern;

Be it known that I, LESLIE'BELDEN, of New York, in the county and State of New York, have invented a certain new and useful Improvement in Hydraulic Jacks, of which the following is a speeilication.

I will describe in detail a hydraulic jack embodying my improvement, and then point out the novel features in claims.

In the accompanying drawings, Figure 1 is a longitudinal section of a jack embodying my improvement. Fig. 2 is a side view thereof.

Smimilar letters of reference designate correspending vparts in both iigures.

A designates a cylindrical metal shell, secured near its endsto cylindrical metallic heads A A2. These heads are secured rml y on the shell A by bolts o, extending between them outside said shell.

B designates a piston within the shell A. It is of less diameter than the shell, so that an annular space is formed between it and the shell when it is within the shell. The piston has a movement longitudinally of the shell imparted to it. It is also hollow, and its interior is filled with liquid. Upon one end of the piston is a block, B', adapted to be placed against the object to helifted or moved. This block is hollow, and, as shown, is internally screwthreaded to facilitate its attachment to the piston. Its interior communicates with the interior of the piston. Passages b extend from its interior. to the externa-l atmosphere. Within the piston is a suitably-packed disk, B2, iitting snugly. NVhen a partial vacuum is created in the hollow piston, as hereinafter to be described, atmospheric pressure holds the disk B2 against the liquid within the piston, thus offering a resistance to the liquid. The cylinder A andthe piston B constitute a reservoir for the liquid. The pistou is propelled in one direction by hydraulic pressure exerted against a piston-head, B3, secured tothe piston near one end, and suitably packed to prevent water passingaround its circumference.

In the position shown in Fig. l the piston occupies its farthest position within the shell A, and the piston and the annular space between it and the shell are filled with liquid. When it is desired to move the piston outwardly, liquid is Withdrawn from the piston and shell and forced in behind the piston-head B3. This is effected by means of a pump 4located. outside the shell A and secured thereto.

Upon one side of the heads A A2 are pro ]'ecting portions c c. The portion c has ex-l ten ding through it an inlet-passage, c, communicating with the annular space between the shell A and the piston B. The portion c has extending through it an outletpassage, c3, communicating with the spaeebehind the pistonhead B3.

Mounted upon the projecting portion c is one lever, C, of a toggle by which the pump is operated. A portion of the lever G surrounds loosely the projecting head A in such manner that the lever may swing upon said portion c. This *lever comprises a pipe, D, formed in such manner that one of its ends will, when in place, extend into a recess within said portion c, and the passage within the pipe will communicate with the passage o2. This end of the pipe D extends through a stufiing-box, d, secured to the portion c of the head A, and is provided within the recess with a paekingring, d, which tends to keep the passage within the pipe in align ment with the passage c. The other end of the pipe D communicates with a passage in a cylindric portion, d1, of the lever C, constituting part of. the jointof the toggle. This portion d10 is provided with a projecting portion having a recess and stuffing-box .similar to the portion c of the head A, and in like manner receives one end of a pipe, D, comprised in a lever constituting the other portion of the toggle. This lever is provided with a portion. loosely surrounding the projecting portion on the portion dw, and may therefore swing on said portion (Zw. The pipe D has a straight portion, d2, extending into a pump-cylinder, E, and constituting the piston for said pump. A suitable stuffing-box is arranged about the piston d2, upon that end of the pump-cylin- -der through which the piston extends. Upon the inner end of the piston d is arranged a reflow clieelevalve, cl3. The pump-cylinder E has a ring-like portion extending loosely about the projecting portion c of the head A, and may swing onsaid projecting portion. A pipe, Di, communicates with the pumpcylinder E near one end thereof, and at the other portieri c of the ICO lzo

end extends into a recess in the portion c and through a stuffing-box in manner similar to the portion c of'the head A. This end of the pipe D2 communicates with the passage c3, opening into the space behind the piston-head B3, and is provided with a redow checkvalve, dt.

It will be observed that liquid may ow 'freely from the inlet-passage c2, through the pipe D, the pipe D', the pump, and the pipe D2, and out at the outlet-passage c3.

The pump is operated by a lever, F, which may be fitted into either a socket, f or f', at the toggle-joint. When the lever F is rocked, the toggle-joint is caused to pursue the path indicated in the arc-shaped dotted line in Fig. 2, and it is obvious that at each forwardfand backward movement of the lever F the piston d2 is caused to make two complete excursions within the pump-cylinder. Furthermore, by the use of a toggle great power can be brought to bear upon the piston-head B.

As previously stated, liquid entering the cylinder A behind thepistoirBs-forces it andthe piston vB outwardly, and of course the distance which the piston B will be so forced is yproportional to the quantity of liquid withdrawn from in front of the -pistonhead and forced in behind'it. .Secured to thepiston-head B3 is a dog, G, here shown as double-ended. This dog is arranged in front of the piston-head and extends transversely to the axis of the piston B, its ends protruding through longitudinal slots g in saidposition. It is mounted upon-a spindle provided with a hollow portion, g', eX- tending centrally through4 the piston-head,and provided upon its end to the rear of the piston-head with a valve, g2. A spring, g3, bearing at one end against the piston-head and at the other against a shoulder on the dog spindle, tends to keep the dog in the position4 shown in Fig. 1, or in such position that no iiuidfcan fiow through the hollow `portion g of the spindle, and so behind the piston-head. When the'piston B has been moved sufficiently far forward, the protruding ends-of the dog G will come in contact with vthe head A', thereby forcing the dog backwardly, together with the hollow portion g of the spindle and the valve g2. Liquid may then ilow from one side of the piston-head to the other through an opening, g, in the portion g of the spindle, and pressure will thus be equalized. When 1t 1s desired to return the piston to the position shown in Fig. 1, communication is opened between the spaces in front and to the rear of the piston-head by turning a cock, II, in a pipe, I, communicating by means of passages in the heads AAz of the cylinder A with such spaces. When the jack is in operation, this cock is of course closed. I prefer to construct the pipe I in sections and join the sections by unions J.

Each of the unions J is composed of a shell or cylinder, J, having screw-threaded ends which receive internally screw-threaded caps J2. Vithin thecaps J2 are stuffing-boxes J3, through which extend the adjacent ends of the sections of the pipe I. These ends of the sections-of the pipe I are screw-threaded externally, and are provided with anges J4, shown as consisting of nuts. Between these anges is a washer, J5. By this arrangement the unions may be lengthened or shortened, as desired, and a tight joint still be preserved.

Itwill be seen that the liquid in this jack may be used repeatedly, and also that the jack may be held inany position when in use.

, What I claim as my invention, and desire to secure by Letters Patent, is-

l. The combination, with a reservoir for liquid, of a pump, a toggle for operating said pump, comprising swinging levers and pipes, and stufiing-boxesiinto which certain endsof the pipes extend and within which they may rotate, substantially as specified.

2. In a hydraulic jack, the combination, with a cylinder, of a hollow piston within the cylinder,provided with apiston-head, passages communicating with the cylinder upon each side of the piston-head, a pump, a toggle for operating said punip, comprising swinging' levers and pipes communicating with said passages, and stuffing-boxes into which certain ends of the pipes extend and withinwhich they may rotate, substantially as specified.

.LESLIE BELDEN.

Vtitnesses:

J. R. BOWEN, MAURICE J. Renon. 

